Wilhelm herzberg and oscar weber



UNITED STATES PATENT OFFI E.

\VILHELM HERZBERG AND OSCAR WEBER, OF BERLIN,GERMANY, ASSIGNORS TO THE AOTIEN GESELLSGHAFT FUR ANILIN FABRIKATION, OF SAME PLACE.

BLUE 'DYE.

sPEc'IFIoATIoN forming part of Letters iPatent No. 539,738, dated May 21, 1895. Application filed February 23, 1895. Serial No. 539,438. (Specimena) Patented in France October 1, 1894, No. 241,756.

a To all whom it may concern.-

Be it known that we, VVILHELM HERZBERG and OSCAR WEBER, of Berlin, in the Kingdom of Prussia, German Empire, have invented new and useful Improvements in the Manu facture of Blue Dye, (for which a patent has been issued in France to our assignees, the Actien-Gesellschaft fiir Anilin Fabrikation, No. 241,756, dated October 1-, 1894;) and we do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

In the specification forming part of Letters Patent No. 5522;897, dated July 10, 1894, we have described a blue coloring-matter obtained by heating with sulfur and fuming sulfuric acid the condensation-products obtained from ortho-quinone compounds and alkylpara-phenylendiamin compounds. The constitution of these dye stuffs corresponds to the following typical formula:

tain according to our researches as radical the bodies the constitution of which may be represented by the following typical formula:

(R and R signifying alkyl-groups; but in as far as secondary amines be used one of these Rsignifies hydrogen.) The dye-stuifs derived from such condensation products possess the constitution corresponding to the following typical formula:

nos s NO6H3.N g

By comparing this formula with that one belonging to the products mentioned in the specification No. 522,892 it may be seen that the new dies contain the quinonimid group while the former one contains the quinon group. a

The coloring matters forming part of the present application are also capable of form; ing lakes with metallic mordants which dye with beautiful fast blue tints and are especially well suited for dyeing and printing wool and cotton, previously mordanted with chromium.

The following example is given to illustrate the manner in which we may practically carry out our invention.

26.1 kilograms of the sodium salt of the alpha,- beta,- amidonaphtol beta monosulfo acid are dissolved in four hundred liters of water and while agitating 18.6 kilograms of the hydrochloric salt of the nitrosodimethylanilin, dissolved in four hundred liters of water, are added. After three or four days the condensation is completed and the condensation product is filtered off, pressed and dried. -The product thus obtainedforms in dry state a blue-black powder and can be transformed'into the blue dye-stuff in the following manner:

Ten kilograms of the same and two kilograms flowers of sulfur are dissolved in one hundred kilograms of funding sulfuric acid, containing about twenty-three per cent. of anhydrid and heated for five or six hours at a temperature between 40 and 60.

into water and the precipitate is separated by filtration and afterward dissolved in diluted soda solution. The solution obtained is fil- I00 The whole is poured tered in order to remove the sulfur and the coloring matter is then precipitated by means of common salt. The new product thus obtained forms a blue crystalline powder which 5 is moderately soluble in cold, more readily in hot water with a violet blue color. On addition of caustic soda the color turns more gray violet. The dye dissolves in concentrated sulfuric acid with a green color, and by diluting with water the free color acid is precipitated as a blue powder, which is slightly soluble in alcohol with a violet color and insoluble in ether. The coloring matter may be easily reduced in acid or alkaline solution, but it is very readily reoXidized-alreadyin the open air.

In the above described process the sulfur can besubstituted by substances capable of forming sulfur-sesqui-oxide (S 0 when used along with fuming sulfuric acid.

what we claim as new, and desire to secure by Letters Patent, is-

1. The process for the production of blue dyes which consists in heating with sulfur and fuming sulfuric acid the condensation products obtained from an alpha -beta -amidonaphtol-derivative and a para-nitroso-derivative of an alkylated amin in the manner as hereinbefore described.

2. As a new article of manufacture the blue dye derived from-an alpha -beta -amidonaphcpl-derivative and a para-nitroso-derivative 5 of an alkylated amin, having (in case alpha- NQMOHQQ said dye being slightly soluble in alcohol with a violet color insoluble in ether, moderately soluble in cold, more readilyin hot water with a violet blue color, which on addition of canstic soda-solution turns more gray-violet; dissolving in concentrated sulfuric acid with a Having now described our invention and in what manner the same is to be performed,

green color, which on adding water changes into blue while the color acid is separated in the shape ofa blue powder; yielding by reduction a leuco-cornpound, readily reoxidizable.

In testimony whereof wehereunto set our hands andaffix our seals, in the presence of two witnesses,-this 7th day of February, A. D. 1895.

WILH-ELM' HERZBERG. L. s] OSCAR WEBER. L. at 

